Standing at the base of one of the cliffs of Mt. Arapiles in Victoria, Australia, a hiker hears a rock break lose from a height of 129 m. He can’t see the rock right away but sees it 1.74 s later. How far above the hiker is the rock when he can see it?
Express your answer in meters.
How much time does he have to move before the rock hits his head?
Express your answer in seconds.
